When the boss .... into the office, his secretary ...., and the accountant .... on the phones

When the boss .... into the office, his secretary ...., and the accountant .... on the phones

Đề bài: When the boss .... into the office, his secretary ...., and the accountant .... on the phones.

A. was walking / has been typing / has been talking

B. had walked / was typing / had talked

C. walked / was typing / was talking

D. had been walking / had typed / talked

Lời giải:

Đáp án: C

Giải thích: một hành động xảy ra xen vào một sự việc đang xảy ra trong quá khứ

Dịch: Khi ông chủ bước vào công ty, thư kí đang đánh máy và nhân viên kế toán đang trả lời điện thoại.